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Isla Simpson ISLA SIMPSON CAS, Climate and Global Dynamics Laboratory Phone: +1(303) 497-1763 National Center for Atmospheric Research Email: [email protected] 3090 Center Green Drive Website:http://www.cgd.ucar.edu/staff/islas/ Boulder CO 80301 Research Interests My research interests lie in the use of global climate models of varying levels of complexity to understand dynamical mechanisms involved in the climate system. I am interested in understanding the current climate and its variability, at scales ranging from the planetary to the regional, as well as determining the robust responses to climate change and their implications, through a deeper understanding of the processes and mechanisms involved. I am also interested in the biases that occur in global climate models, how they may be alleviated and what the implications of these biases are for our ability to predict the future of the climate system. To date there has been a focus on the coupled stratosphere-troposphere system, the dynamics of the tropospheric mid-latitude circulation and its response to forcings, longitudinal variations in the mid-latitude circulation response to anthropogenic forcings and the importance of topography for the climate of the Mediterranean region. Education 2005-2009 PhD in Atmospheric Physics, Department of Physics, Imperial College London, UK 2001-2005 MPhys in Astrophysics, 1st class honours, School of Physics and Astronomy, University of St Andrews, UK Research Experience and Employment 2019-.... Scientist 2 Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, USA. 2015-2019 Scientist 1 Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, USA. 2014-2015 Associate Research Scientist Lamont-Doherty Earth Observatory, Columbia University, USA. 2012-2014 Postdoctoral Fellow. Lamont-Doherty Earth Observatory, Columbia University, USA. Supervisors: Prof Richard Seager and Prof Tiffany Shaw (Lamont-Doherty Earth Observatory) Synopsis: I was awarded a Lamont-Doherty Earth Observatory postdoctoral fellowship to perform research into mid-latitude climate change. I investigated longitudinal variations in the mid-latitude circulation response to anthro- pogenic forcing and the robust predicted circulation responses on the regional scale. I analyzed the longitudinally varying momentum budget of predicted future changes in model output from the Coupled Model Intercomparison Project, phase 5, and demonstrated robust stationary wave responses to climate change with important implications for regional scale climate. I then focused on the understanding the mechanisms involved in the stationary wave response over North America and the implications of this for North American hydroclimate. In addition to this, I worked on understanding the role of relatively small scale topography in the climate of the Mediterranean region and on determining the regional response to sudden stratospheric warmings and the mechanisms involved. Each of these involve idealized experiments with comprehensive global climate models. 2009-2012 Postdoctoral Fellow. Department of Physics, University of Toronto, Canada. Supervisor: Prof Ted Shepherd (Department of Physics, University of Toronto) Synopsis: I designed and performed experiments using a comprehensive general circulation model (the Canadian Middle Atmosphere Model) to gain a deeper understanding of the dynamical mechanisms involved in mid-latitude atmospheric circulation variability and its biases in models as well as mechanisms in stratosphere-troposphere cou- pling. In particular, I made use of nudging and bias correction techniques in the model to pull apart the relevant processes that govern Southern Annular Mode variability and its bias in models. I also performed model experi- ments to determine the dynamics behind the lower stratospheric circulation response to ENSO variability. 2010 Sessional lecturer in advanced atmospheric dynamics. Department of Physics, University of Toronto, Canada. I gained experience in teaching through a sessional lecturer position at the University of Toronto in which I taught a semester long (2 hours per week) graduate course in advanced atmospheric dynamics. This involved developing and delivering graduate level lectures, the preparation of problem sets, exams and the marking of research projects. For this course, the students rated my teaching ability with an average of 4.8 out of 5. 2005-2009 PhD in Atmospheric Physics. Imperial College London, UK. Thesis title: Solar Influence on Stratosphere-Troposphere Dynamical Coupling Supervisors: Prof Joanna Haigh (Department of Physics, Imperial College London) and Dr. Mike Blackburn (Department of Meteorology, University of Reading) Synopsis: My PhD research involved the use of a simplified general circulation model to investigate the mecha- nisms whereby lower stratospheric temperature perturbations influence the tropospheric circulation. I proposed a mechanism whereby stratospheric heating perturbations result in a latitudinal shift of the mid-latitude westerlies through an influence on the propagation of synoptic scale atmospheric eddies. This is relevant for various climate forcings such as the 11 year solar cycle, ozone depletion and increased anthropogenic emissions of greenhouse gases. For this work I was awarded the Winton prize for the best PhD thesis in the physics department of Imperial College in 2009. Pre-2005 In summer 2003 I undertook a research project investigating the accretion of material from the protoplanetary discs around young stars along their magnetic fields and for this work I was awarded the Cormack undergraduate astronomy research prize which led to me presenting my work at the Royal Society of Edinburgh. In summer 2004 I investigated the possible use of laser light scattering spectroscopy for the non-invasive early diagnosis of cervical cancer and I wrote an MPhys thesis on the use of Optical Gravitational Lensing to determine exoplanetary systems. Publications • Simpson, I. R., McKinnon, K. A., Davenport, F. V., Tingley, M., Lehner, F., Al Fahad, A. and Chen, D. (2021) Emergent constraints on the large scale atmospheric circulation and regional hydroclimate: do they still work in CMIP6 and how much can they actually constrain the future? In press, J. Clim • McKinnon, K. A., Poppick, A., Simpson, I. R. (2021) Hot extremes have become drier in the US southwest, In Press, Nature Climate Change • Anstey, J. A., Simpson, I. R., Richter, J. H. ( + 26 QBOi co-authors): Teleconnections of the quasi-biennial oscillation in a multi-model ensemble of QBO resolving models, QJRMS, In Press • Haynes, P., Hitchcock, P., Hitchman, M., Yoden, S., Hendon, H., Kiladis, G., Kodera, K. Simpson, I. R. (2021) The influence of the stratosphere on the tropical troposphere, J. Met. Soc. Japan, 99 • Fu, R., Hoell, A., Mankin, J., Sheffield, A. and Simpson, I.: Tackling challenges of a drier, hotter, more fire-prone future, EOS • Banerjee, A., Butler, A. H., Polvani, L. M., Robock, A., Simpson I. R., Sun, L. (2021) Robust winter warming over Eurasia under stratospheric sulfate geoengineering - the role of stratospheric dynamics, ACPD, Accepted • Bacmeister, J. T., Hannay, C., Medeiros, B., Gettelman, A., Neale, R., Fredriksen, H.-B., Lipscomp, W. H., Simpson, I. R., Bailey, D. A., Holland, M. M., Lindsay, K., Otto-Bliesner, B. L. (2020) CO2 increase experiments using the Community Earth System Model (CESM): Relationship to climate sensitivity and comparison of CESM1 to CESM2, JAMES, doi:10.1029/2020GL089470 • Visioni, D., MacMartin, D. G., Kravitz, B., Lee, W., Simpson, I. R., Richter, J. H. (2020) Reduced Poleward Transport Due to Stratospheric Heating Under Stratospheric Aerosols Geoengineering, Geophys. Res. Lett., doi:10.1029/2020GL089470 • Chen, R., Simpson, I. R., Deser, C., Wang, B. (2020) Model Biases in the Simulation of the Springtime North Pacific ENSO Teleconnection, J. Clim., 33, 9985-10002 • Deser, C., Phillips, A. S., Simpson, I. R., Rosenbloom, N., Coleman, D., Lehner, F., Pendergrass, A. G. (2020), Iso- lating the Evolving Contributions of Anthropogenic Aerosols and Greenhouse Gases: A New CESM1 Large Ensemble Community Resource, J. Clim., 33, 7835-7858. • Kim, H., Caron, J. M., Richter, J. H. and Simpson, I. R., QBO-MJO connection in CMIP6 models (2020), Geophys. Res. Lett., 47, doi:10.1029/2020GL087295 • Simpson, I. R., Bacmeister, J., Neale, R. B., Hannay, C., Gettelman, A., Garcia, R. R., Lauritzen, P. H., Marsh, D. R., Mills, M. J., Medeiros, B., Richter, J. H., An evaluation of the large scale atmospheric circulation and its vari- ability in the Community Earth System Model 2 (CESM2) and other CMIP models (2020), J. Geophys. Res., 125, doi:10.1029/2020JD032835 • Ayarzaguena, B., Charlton-Perez, A. J., Butler, A. H., Hitchcock, P., Simpson, I. R., Polvani, L. M., Butchart, N., Gerber, E. P., Gray, L., Hassler, B., Lin, P., Lott, F., Manzini, E., Mizuta, R., Orbe, C., Osprey, S., Saint-Martin, D., Sigmond M., Taguchi, M., Volodin, E. M., Watanabe, S., Unvertainty in the response of sudden stratospheric warmings and stratosphere-troposphere coupling to quadrupled CO2 concentrations in CMIP6 models, J. Geophys. Res., doi:10.1029/2019JD032345 • Richter, J. H., Anstey, J., Butchart, N., Kawatani, Y., Meehl, G., Osprey, S., Simpson, I. R. Progress in simulating the Quasi-biennial Oscillation in CMIP models, J. Geophys. Res, 125, doi:10.1029/2019JD032362 • Chen, R., Simpson, I. R., Deser, C., Wang, B., Model biases in the simulation of the springtime North Pacific ENSO teleconnection,
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